Fsa 1-3/8'' IS-2-138 ACB 36°x45° dual seal MR031 headset Bearing - Black
Fsa 1-3/8'' IS-2-138 ACB 36°x45° dual seal MR031 headset Bearing - Black - One size is backordered and will ship as soon as it is back in stock.
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Product details
Product details
FSA 1-3/8" Headset Bearing IS-2-138 ACB: Performance and Reliability
The FSA 1-3/8" headset bearing is a high-quality technical solution for modern bicycle steering systems. This sealed bearing is designed with 36° and 45° contact angles, ensuring optimal load distribution and directional stability while riding. The dual seal configuration effectively protects against dirt and moisture, maintaining mechanical performance over time. The Cr-Mo balls provide superior wear resistance and reliability in a wide range of riding conditions, from road rides to more demanding trails.
Dimensional Specifications and Component Composition
The inner and outer dimensions are calibrated to ensure compatibility with next-generation IS-2-138 headset systems. With an inner diameter of 37mm and an outer diameter of 48.9mm, this ball bearing offers a compact height of 6.5mm, ideal for precise integration in the steerer tube. The 36°x45° angular geometry optimizes resistance to lateral and vertical forces. The 22 Cr-Mo alloy balls, each with a diameter of 1.8", distribute forces evenly, reducing concentrated stress and extending the component’s service life.
Technical Advantages and Applications
The ACB design (Angular Contact Ball) is the standard for high-performance headset bearings, preferred by professional builders and mechanics. The dual sealed protection keeps internal lubrication in place even in damp or dusty environments, reducing the need for frequent maintenance. This headset bearing is suitable for road bikes, gravel and mountain bikes with head tubes compatible with the IS-2-138 standard. The reliability of the MR031 bearing makes it a trusted choice among cycling enthusiasts looking for durable, high-performance components, with smooth rotation and precise steering guaranteed over time.
Technical Features
- Headset standard: IS-2-138 1-3/8".
- Inner diameter (ID): 37mm.
- Outer diameter (OD): 48.9mm.
- Height (H): 6.5mm.
- Contact angles: 36° (inner) and 45° (outer).
- Number of balls: 22.
- Ball diameter: 1.8".
- Ball material: Cr-Mo (chromium-molybdenum steel).
- Protection: sealed dual seal.
- Model: MR031 FSA.
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Shipping and delivery times
Shipping and delivery times
Orders are usually shipped within 24-72 hours (1-3 days) from payment receipt. Some items may have longer shipping times (5-7 days). The specific shipping times are indicated on each product page.
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Shipping costs start from
| € 6.50 | STANDARD SHIPPING in Italy with express courier |
Shipping times and costs may vary depending on the delivery country, chosen service, and weight.
Shipping with InPost service
| € 5.00 | Italy |
| € 12.00 | France, Benelux, Spain, Portugal, Poland |
Bicycle shipping
Shipping costs for all bicycles are fixed as follows.
| € 39.00 | Italy |
| € 49.00 | Europe |
| € 69.00 | Rest of the world |
Non-EU shipping
Local VAT and any customs duties for shipments of goods to customers outside the European Union (non-EU) will be charged to the recipient and requested by the courier at the time of delivery. If the delivery is not made due to refusal to pay the customs duties (local VAT and any applicable tariffs) requested by the importing country, all costs incurred by us for the return of the goods will be deducted from the refund.
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All online-ordered items can be picked up at the All4cycling store in the province of Varese, Via Gianfranco Miglio 2, 21045 Gazzada Schianno (VA).
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Returns and refunds
Returns and refunds
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RETURN SHIPPING COSTS
| Italy | FREE return at Poste Italiane post offices and collection points, following the instructions provided |
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The costs shown apply to returns made due to a change of mind. If the product is incorrect, damaged or not as described due to a cause attributable to All4cycling, the necessary return shipping costs will not be charged to the customer.